Jo Jul 7, 2025

Aluminum and its alloys have light weight, good thermal and electrical properties, excellent mechanical properties and process ability, and low cost, so they are widely used in various fields of the national economy such as the mechanical industry, aerospace, daily necessities industry, electronic industry, building materials industry, etc. Aluminum and its alloys are easily oxidized in the atmosphere because of their strong chemical activity, resulting in a thin oxide film on the surface, which is protective because of its good corrosion resistance in dry air, but it is easily damaged in contaminated atmosphere, water, seawater, soil and various corrosive media, which is not protective. Therefore, surface treatment is carried out to enhance the surface performance of aluminum and its alloy, such as corrosion resistance, wear resistance and decorativeness.

At present, the sealing of anodized aluminum alloy is carried out at high temperature, which leads to high energy consumption and low productivity.

Kim Chang Sok, a researcher at the Science Engineering Institute, has investigated the sealing mechanism of Ni-F system to realize room temperature sealing, one of the ways to reduce energy consumption and shorten the production cycle in the sealing process for surface treatment of aluminum alloy, and investigated the influence of various factors on the room temperature sealing quality to confirm a reasonable room temperature sealing process index.

Through the room temperature sealing experiments of aluminum alloy 6061, he has found that the optimum conditions are Ni2+ concentration of 1.5g/L, F- concentration of 2g/L, sealing temperature of 20~30℃, sealing time of 15~20min and pH of 5.5~6.5.

The surface properties of the samples sealed at room temperature are superior to the surface properties of the existing sealed samples at high temperature. In addition, the sealing temperature can be lowered by over 70℃ and the time for sealing can be shortened by 15 minutes, which leads to the decrease in energy consumption for heating sealing solution and the increase in productivity.